Improvement in stop-valves



S. P; M. TASKER.

Improvement in Stop-Valves.

N0.128,924, Patented Ju|y9,1872.

FIG Q FIG.%* was A Ill mllllllllf "llifilii'iilllll WITNESSES INVENTUR V,Zy fliiorney UNITED STATES PATENT OEEIoE.

STEPHEN P.'M. TASKER, OF PHILADELPHIA, PE NsYLvANIA.

IMPROVEMENT IN STOP-VALVES.

Specification forming. part of Letters Patent No. 128,924, dated July 9,1872.

valves inwhich duplicate disks are operated by the same screw-stem andclose against fiat seats at opposite points. It consists of sphericalinclines on the inner faces of duplicate disks, so constructed andarranged in relation to each other that the pressure of the ends of thescrew-stem upon one of the disks, as here inafter described,'forces theinclines together and expands the disks, and thereby closes them upontheir seats. As the spherical inclines may turn freely on each other inany direction, when either disk is tilted, by something getting betweenit and its seat,the normal position of the opposite disk is notdisturbed.

Figure l is a longitudinal section of the improved valve. Fig. 2 is asectional view of the I duplicate disks E and E, showing theirarrangement when opened from their seats. Figs. 3 and 4 are an insideface view and an edge view of the disk E. Figs. 5 and 6 are like viewsof the disk E.

Like letters in all the figures indicate the same parts.

A is the valve-box, which has openings a a for connecting it to thepipes in the usual manner. B is the center-piece, connected with theprojection b of the box A, and having a central screw-nut, d, andstuffing-box 0, through which the screw-stem D works for operatingthedisks E and E. The disks are shown in detail in Figs. 3, 4, 5, and 6.The disk E, with which the inner end of the screw-stem D is connected,is provided with a spherical incline projection, 0, and the disk E, alsoconnected with the stem, has a spherical incline depression, f. The saidinclines are so constructed and arranged in relation to each other thatwhen the disk E is forced forward by the turning of the screw-stem 1)the incline e presses against the incline f of the disk E and spreadsthe two disks apart so as to close them upon their seats, as representedin Fig. 1. By a reverse movement of the screw-stem D the inclines areseparated from contact with each other, and allow the disks to cometogether, as seen in Fig. 2, to open them from their seats.

I claim as my invention The combination of male and female sphericalinclines e f of the duplicate disks E and E, so constructed and arrangedthat the tilting of either disk from its valve-seat shall not disturbthe normal position of the opposite disk, sub stantially as described.

STEPHEN P. M. TASKER.

Witnesses:

THOMAS J. BEWLEY, STEPHEN UsTIcK.

